delay migration: Morrissey was studying imidacloprid, one of a number of neonicotinoids that are among the most commonly used agricultural insecticides in Canada, according to Vancouver Courier. They are chemically related to nicotine and disrupt the nervous system. In the first study to combine field and lab work, Christy Morrissey of the University of Saskatchewan has found that one type of neonic insecticide causes sparrows to lose weight and delay migration.article continues below Trending Stories Five years ago, a giant statue of Satan with an erection enthralled Vancouver Canadians warned to avoid non-essential travel' to parts of Mexico Vision Vancouver will not run a mayoral candidate for first time in party's history Cheeky umbrellas capitalize on a Vancouver constant The chemical seems to have a pretty strong and consistent effect on weight loss, said Morrissey, whose research was published Thursday in the journal Science. Although the chemical has long been suspected of harming bees, Morrissey said its impact on birds is less understood. Field studies rarely allow researchers to definitively link cause and effect. Previous studies have been done either in the field or in the lab, she said. (www.immigrantscanada.com). As reported in the news.